Double-radius grinding-machine.



C. F. 'WALL & F. HARKER. DOUBLE RADIUS GRINDINGMACHINE.

APPLICATION FILED M'AY 2,4914.

1 1 2 1 I Patented May 25, 1915.

Na. 5. HQ. 6 I 1 V 4 1a 1s ATTORNEY manner.

CHARLES F. WALL AND FREDERICK HABKEB, OF PHILADELPHIA. QENNSYLVANIAQ DOUBLE-RADIUS GRlINDING-MACHINE.

Specification of Letters Patent.

' Patented May 25,1915.

Application filed may 2, 1914. Serial E0. 835,852. I

TO aZZ whom it may concern v Be it known that we, CHARLES F. WALL and Fnnnnnrcn HARKER, citizens of the 'Grinding-Machines, of which United States, and residents of the city of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented certaih new and useful Improvements in Double-Radius the following is a specification.

Our invention relates to machines adapted to be used in the grinding of concaved surfaces having diii'erent radii of curvature in different planes through such surfacesat right angles to each other.

One object of our invention is to prov de means whereby parts of the apparatus embodying the same maybe quickly proximated to such positions relatively to each other as it is desired they shall occupy during the grinding operation.

A further object of our invention is to provide a machine which-is simple inconstruction, consistii. g of few parts, and which may be cheaply and economically constructed.

Although our invention may be used for illustrated one form of a convenient embodiment of our invention but it will beunderstood that the same is susceptible of being embodied in other forms and that changes in the details of construction may be made without departing from the scope of our invention. p p

In the drawings Figure 1 is a side elevation of a machine embodying our invention; Fig. 2 is a view partly in top plan and partly in horizontal section; Fig. 3 is a front end elevation thereof; Fig. 4 is a transverse sectional view on the line H of Fig. 3; Fig. 5 is a sectional view through a tool which has lJCCll-0[')Ql'l1t8(l on by the machine embodying our invcntirm; and Fig. 6 is a. view showing a section of the same tool taken at right angles to the view shown in Fig. 5. i

In the drawings, 1 designates the top porsupported. The be tion of a pedestal u on which a bed 2 is 2 is provided with pedestals 3, one of which is shown in elevation in Fig. 1 of the drawings, which pedes tals are provided with bearings and 5 at their upper ends in which a 'revoluble shaft 6 is mounted. Theshaft is provided with a band wheel 8, situated intermediate the bearings 4 and 5, by means of which the shaft 6 may be driven from any suitable source of power.

10 designates a grinding wheel of emery or other suitable material which is removably secured to the end of the shaft 6 between the' clamping plates 11 and 12 by means of a nut 13. The grinding wheel is made removable so that wheels of different diameters may be employed for operating upon the work.

' The bed 2 is provided with forwardly projecting portions 14 and 15 upon which a rectangular bar 16 is mounted. At its forward endthe said bar, is located in a recess.

17 formed in the projecting portion 15 of the-bed 2 so that the top. of the bar 16 is flush with the top surface of the projecting portion 15 thereby making a smooth surface which is necessary as will hereafter appear.

.The work 18, which in the construction illustrated consists of a toolto be employed in the manufacture of toric lenses, is provided with a shank 19 which projects through a split sleeve 20 in the ai'pper end of a standard 21. The said shank is clamped in said sleeve by .means of a screw-threaded bolt 22. If after the work has been partially completed it is removed from the split sleeve 20 and it is desired to replace the same it is necessary that it be replaced in exactly the same position it occupied previous to removal. To insure that it shall be so replaced the shank 19 is provided with a pointed depression 22 which isengaged by the pointed end of a screw 23 which is secured in the split sleeve 20 as shown. To remove-the work from the sleeve 20 the screw-threaded bolt is loosened and the screw 23 is turned 6 i {screw-threaded rod 38, such rod hole. A wedge orbinding stri 29 Is'interposed between the edge 9 sai bar and the side of said hole or opening 28 and 1s adapted to be clamped tightly against the said bar by means of a cam 30 uponna'rotatable member 31 whieh is adapted'to be turned by means ofa handle 32. By turning the cam 30 in one direction the wedge 29 is loosened so that the standard 21'1I'1ay be moved inwardly er outwardlyup'on the bar 25 to such position as may v again clam ed so that it may be held 1n such position. he block 27 is alsoprowded with,

may be clamped, if desired, in any position on such bar to which it may be -means of a cam upon the rotatable morn s 35, the latter being turned by means'of the handle 36. The said cam operates against-a.wedge or bindin strip 37 situated between the edge of the. ar 16 andgr'side of the hole through the block 27. The pivot 26 26 consists of a shouldered screw-threaded member which is screwed into the upper side of the slide block 27. After the standard 21 has been adjusted'upon the bar to such position as may be desired with respect to 30 may be desirable and necessary to adjust the said standard together with the bar 25 and parts connected thereto either forwardly or baclrwardly so as ,to properly position the work with respect to the peripheral grinding surface of, the grinding wheel 14). To accomplish such adjustment and positioning we ave provided a rod 38 which is revolubl supported in projection 39 which exten s downwardly from the projecting portion 1'5 of the bed 2. 41 designates'a collar secured upon the rod 38, which collar is seated against the rojection 39 so as to prevent forward disphice- 46 ment of the rod 38. Movement in the oppo- .site direction of said rod is prevented by the fact that the inner end of the hub 42 of the handle 43 which is'secured to the outer forward end of the rod 38 rests against the opposite side ofthe projection 39. The forward end of the rod is screw-threaded, as indicated at 45; and is in engagement with a projection 46 which. is connected with and extends (lOVtIlWitIdlYfI'OlTl the slidable'bloek 27. It will be seen, therefore, that when the cam'35 is turned so as to loosen the wedge which is-adapted to be. clamped against the 4 side of the har l6 the slide block 27 and bar 25 may be adjusted either forwardly or baclrw'ardly' upon the'har Iii-by turnin the o "turnedby'the handle 43. L For the purpose of approximating the po 1 sition. to {wh ch the standard 21 should be v adjusted upon the ar 25 we have provided he desired and a hole extending therethrough through which the bar 16 extends and the said block" oscillation of the sleeve 51 is in exact alinethe axis of oscillation of the said her 25 it; A

E the apparatus we shall desm'ibe the opera- 'tion of'tlie same. The work to be 0 rated upon is secured in the split sleeve from the sleeve a distancefequal orsubstantioned is clamped b means of th' wedge 29 bar 25. The latter extends said; the following instrumentality, to wit, a

- any position to which it may be adjusted in thesleeve bymeans of a binding screw 55.

"The axis of the pivot 53 whichis' the axis of ment with the axis of oscillation of the bar .a

25' and also is in exact 'alinement with the A the base or portionv of thesaid pedestal which slides over or upon, the ro'ec'ti portion 15 of the snpportingkbed far as ossible, the v1 ration or wabblingof l 'the p estal 21 whenthe latter is'oscilla-t *f during theoperation of'the machine." a. f.

Having now described the construction'of.

fat t upper end'of the standard'21. )The rod: 49'; is then adjusted 'so that it projectsforvgierdly' tially'equal to the radius of One1otths, curves of the concaved'surfaee which it-is: desired to grind upon the workfortool lfif Thisdistance may be ascertained from theqog scale 50 upon the; said rodor bar-'49. y en the saidrod or bar has been adjusted to the position desired it is clampedin "suchpoeitionby means of the'binding' screw 55.

standard 21 and slide 27'are then adj -1 toward or from each other so that-thejfor-" ward end of the bar 49 contacts with th inner or confronting surface of thewotkfto be operated upon." Thereafter, mattr ss, us

may be turned into such position-that it'doed not interfere with the operation-ofthejmag chine by contacting with the grindin wheel 10 or with the work as it is oscillate The standard 21 after having" been thus peni and cam30 to the then rotated so as to adjust thewslide block a 27 andithe oseillatable bar'25 fhrwardly or backwardly so as to bring the work? 18 into?" operative position with respect to the grinding wheel 10." i r During the grinding operation the bar 25 and the standard 21 fixedly clampedthereto are fed or adjusted toward the grinding tool from time to time'in order to cut away 135 &

desirable for the purpose of preventing, ts

, -iz b ar 25 and' therod '38 is i the work to the extentdesired. Between such adjustments, however, the work is oscillated about the pivot 26, such oscillation being efl'ected by means of the handle 61 upon the standard 21, the operator taking hold of the handle and moving the said standard 21 and the front end of the bar 25 about the axis of the pivot 26 and at right angles to the plane of the grinding wheel 10. The radius of curvature cut by such wheel in planes at right angles to the plane of said grinding wheel will depend upon and will be equal to the distance between the axis of the pivot 26 and the arc of movement of the work 18., The curvature in the opposite direction, that is, in planes parallel to the plane of the grinding wheel 10, will "depend upon and will be governed by the diameter or radius of the said grinding wheel, such curvature being of the same, radius as the radius of the wheel.

During the operation of the machine the Wedge 37 should be clamped against the bar 16 with the tightness necessary to create sullicient friction to prevent accidental displacement, due to vibration of the machine, of the sliding block 27 and the parts connected thereto during the operation of the machine. Preferably such friction should not be sufficient to prevent adjustment of the slide block 27, the bar 25 and the stand ard 21 rearwardly by the turning of the rod 38 so as to feed the WOlk against the. peripheral edge of the grinding tool 10.

We claim i 1. The combination of a revoluble grind ing wheel, an oscillatable member pivoted in rear of and in the plane of said grinding Wheel, a work support secured upon said. oscillatable member in front of said grinding wheel and means'whereby said work support may be adjusted toward or from said grinding Wheel,

2. The combination of a revoluble grinding wheel, an oscillatable member pivoted in rear of and in the plane of said grinding wheel, a work support secured upon said oscillatable member in front of said grinding wheel, means whereby said oscillatable mem-' ber may be adjusted so as to move the said work support toward or from the said grinding wheel without altering the radius of 05- cillation of the said work support and means whereby said work support may be inde' pendently adjusted upon the said oscillatable member toward or from the said grinding wheel. v

The combination of a revoluble grind ing wheel,- an oscillatable member pivoted in rear of said grinding wheel, a Work support secured upon said oscillatable member in front of said grinding wheel, and means whereby said oscillatable member may be manually oscillated. 1 g 4. Thecombinaiionofa revoluble grinding Wheel, an oscillatable bar pivoted in rear of and in the central plane of the said grinding wheel, a work supporting member secured upon said oscillatable bar in front of said grinding wheel, and means whereby said Work supporting member may beadsaid member, means ,supported upon said.

member for locating said carrier and the Work thereon'in the position desired with respect to the axis of the pivot of said piv;

otal connection and a grinding member p0- sltioned between the said adjustable member and the said work support.

' said slidablemember for locating the work upon the said support in the position desired with respect to the pivot of said pivotal connection, and a grinding member for grinding said Work.

'8. The combination of a stationary bar, aslidable member on said bar, a bar pivotally secured to said slidable member, a work support adjustably secured to said pivotal bar, a pivoted measuring device carried by said slidable member, the axis of said pivoted measuring device being in alinement with the axis of the pivot of the said pivoted bar. r

9. The combination of a stationary bar, a slidable block secured thereon, a member pivoted to said block, a work support havingadjustable connection with said member, a standard secured to said block, a measuring device pivotally supported upon said standard, the axis of its pivot being in alinement with the axis of the pivot of the said pivoted member, the purpose of the said measuring device being to position the work at the desired distance from the axis of the pivot of the said pivoted member for the purposes described.

10. The combination of a reiroluble grinding wheel, a stationary supporting bar, a slide block on said bar, amember pivoted to said slide block, a work support on said pivoted member, and adjustable means iorpositioning the work upon said work support a desired predetermined distance from the axis ofthe p1votofthe said pivoted'member.

11. The combination of a removable rev- 'oluble grinding member, an oscillatable work support; for supporting the work in operative relatiofivv to said grinding member,"

and means for ascertaining the position at :whichit IS desired toLlocate the work with respect to the axis of oscillation of the work,

support. v

12. The combination of a revoluble grinding member, an oscillatable work support p for supporting the workin' operative relamding member, means for as-" grinding member: I i v 13. The combination of a revo'luble grlnding wheel, an oscillatable work support, a pivotally supported adjustable member for positioning the work .on said support the desireddistanee from-its axis of oscillation, and a manually operable member for adjusting the work into operative relation to said grinding wheel.

' 14. The combination of arevoluble grindingmember, an oscillatable work support,

7 means for positioning the said work support and the work --carried thereby the:des1red distance from its axis of oscillation, means" for thereafter adjusting the work into operative relation to said grinding Wheel ancl v e work to the said ing wheel at mtervals. o 1 15. The combinaltionof a revolublegrindfor thereafi'er feeding ing wheel, astationary guide bar, a slidable member on, said bar, a bar having pivotal 'connection to said slidablememben'. a work support adjustable upon-the pivoted bar, a Y

' IVObGd' measuring device for positionin the said work support and the'work carri thereb upon the said pivoted bar at the de siredv 'stance' from the'ai'xis of the pivot of said her, means'for clamping the said work support to the pivoted bar at such position, and means for adjusting the saitlfslidable member of the said guide bar so as to move the Work I into operative relation with re speot to said grinding wheel.

In testimony that we claim the foregoing gas 0ur invention we have hereuutosigned our names this let day. of May, A. D. 1914.

CHARLES F. WALL.

FREDERICK BARKER; I

- In the 'resenee of-- J. lAnRY-Bowms, FRAXK, E., BOWERS, 

